<!DOCTYPE html>
<svg style="zoom: 2">
  <image x="-50" y="-50" width="100" height="100"
         xlink:href="data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg'><rect x='50' y='50' width='50' height='50' fill='green'/></svg>"/>
</svg>
